package com.rui.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.rui.reggie.common.BaseContext;
import com.rui.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author : [锐神NO.3]
 * @version : [v1.0]
 * @className : LoginCheckFilter
 * @createTime : [2022/5/17 14:09]
 * @description : [检查用户是否已经完成登录]
 */

@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路劲匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的uri
        String requestURI = request.getRequestURI();

        //2-1.判断桌面端用户是否已经登录
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录, 用户id为: {}", request.getSession().getAttribute("employee"));
            log.info("拦截到请求: {}", requestURI);
            log.info("放行该请求");

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        //2-2.判断移动端用户是否已经登录
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录, 用户id为: {}", request.getSession().getAttribute("user"));
            log.info("拦截到请求: {}", requestURI);
            log.info("放行该请求");

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        //3.查看本次请求的是哪个路径
        log.info("用户未登录，同时拦截到请求: {}", requestURI);

        //4.定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs",
                "/"
        };

        //5.判断本次请求是否需要处理
        boolean check = check(requestURI, urls);

        //6.如果不需要处理，则放行
        if(check){
            log.info("放行该请求: {}", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //7.如果未登录则返回登录页面, 通过输出流的方式向客户端页面响应数据
        log.info("不放行, 返回登录页面");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String requestURI, String[] urls) {
        for (String url : urls) {
            if (PATH_MATCHER.match(url, requestURI)) {
                return true;
            }
        }
        return false;
    }
}
